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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on KMgFe(PO4)2 by Materials Project

KMgFe(PO4)2 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.78–3.34 Å. Mg2+ is bonded to four O2- atoms to form MgO4 tetrahedra that share corners with four PO4 tetrahedra. There is one shorter (1.91 Å) and three longer (1.93 Å) Mg–O bond length. Fe3+ is bonded to four O2- atoms to form FeO4 tetrahedra that share corners with four PO4 tetrahedra. There is one shorter (1.84 Å) and three longer (1.92 Å) Fe–O bond length. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one FeO4 tetrahedra and corners with three equivalent MgO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.53–1.59 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one MgO4 tetrahedra and corners with three equivalent FeO4 tetrahedra. There is one shorter (1.50 Å) and three longer (1.57 Å) P–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Mg2+, and one P5+ atom. In the third O2- site, O2- is bonded in a linear geometry to one Fe3+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a linear geometry to one Mg2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent K1+, one Mg2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent K1+, one Fe3+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Mg2+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K4MgFe3(PO4)5 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KMgFe(PO4)2 by Materials Project

KMgFe(PO4)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.80–3.01 Å. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with four PO4 tetrahedra, a cornercorner with one FeO5 trigonal bipyramid, edges with two equivalent MgO6 octahedra, and an edgeedge with one PO4 tetrahedra. There are a spread of Mg–O bond distances ranging from 2.04–2.26 Å. Fe3+ is bonded to five O2- atoms to form FeO5 trigonal bipyramids that share a cornercorner with one MgO6 octahedra and corners with five PO4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. There are a spread of Fe–O bond distances ranging from 1.93–2.04 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent MgO6 octahedra and corners with two equivalent FeO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 54–57°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one MgO6 octahedra, corners with three equivalent FeO5 trigonal bipyramids, and an edgeedge with one MgO6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are a spread of P–O bond distances ranging from 1.54–1.58 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Mg2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to two equivalent Mg2+ and one P5+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Mg2+, one Fe3+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Fe3+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, two equivalent Mg2+, and one P5+ atom.

36 MATERIALS SCIENCE↗